Vince Verhei examines what's gone haywire with the Bills defense despite a big addition in the offseason. Of particular concern, opponents are absolutely torching Buffalo’s defense once they cross the 40-yard line … but is some of the damage self-inflicted?

"The Buffalo Bills made the biggest signing in free agency last offseason when they acquired pass-rusher Mario Williams, formerly of the Houston Texans. Williams, the top free agent on the market, signed a six-year, $100 million contract to help save a defense that gave up 27.1 points per game in 2011, 30th in the NFL."